Petra Granlund (now Petra Sandberg) born 15 October 1987 is a Swedish swimmer from Valla, representing Väsby SS. Granlund participated in the 2008 Summer Olympics for Sweden in the 200 m butterfly and in the 4 à200 m freestyle relay. She finished 14th in the 200 m butterfly and 8th in the 4ÃÂ200 freestyle relay, alongside Josefin Lillhage, Gabriella Fagundez and Ida Marko-Varga.